When the Sheriff greets Max and Logan while they are having photos printed, the first photo is shown most of the way out of the printer. However, in the next shot the photo being printed is not as far out of the printer and there are no photos in the catch tray.
Original Cindy opens Sketchy's camera, overexposing the film. Later on, the prints are all shown to be solid black. In reality, the prints would have been solid white.
The wires are visible when the boy telekinetically lifts Max in the air.